Add support for osx.

GNUmakefile

@@ -9,7 +9,7 @@ UNAME:=		$(shell sh -c 'uname 2> /dev/null || echo undefined')
 
 CFLAGS+=	-Iinclude -DFKEYS -DREGEX -DXKEYS
 
-LDADD+=		-lcurses -lcrypto -lrt
+LDADD+=		-lcurses
 
 SRCS=		autoexec.c basic.c bell.c buffer.c cinfo.c cmode.c cscope.c \
 		dir.c dired.c display.c echo.c extend.c file.c fileio.c \
@@ -20,10 +20,13 @@ SRCS=		autoexec.c basic.c bell.c buffer.c cinfo.c cmode.c cscope.c \
 
 ifeq ($(UNAME), Linux)
 CFLAGS+=	-D_GNU_SOURCE
+LDADD+=		-lcrypto -lrt
 SRCS+=		compat/arc4random.c compat/arc4random_uniform.c \
 		compat/explicit_bzero.c compat/fgetln.c compat/fparseln.c \
 		compat/getentropy_linux.c compat/strlcat.c compat/strlcpy.c \
 		compat/strtonum.c
+else ifeq ($(UNAME), Darwin)
+SRCS+=		compat/fparseln.c compat/strtonum.c
 endif
 
 OBJS=		$(SRCS:.c=.o)

include/limits.h

@@ -0,0 +1,10 @@
+#include_next <limits.h>
+
+#ifndef MG_COMPAT_LIMITS_H
+#define MG_COMPAT_LIMITS_H
+
+#if defined(__APPLE__)
+#define LOGIN_NAME_MAX	MAXLOGNAME
+#endif
+
+#endif

include/stdlib.h

@@ -10,6 +10,8 @@ uint32_t	arc4random(void);
 void		arc4random_buf(void *, size_t);
 uint32_t	arc4random_uniform(uint32_t);
 long long	strtonum(const char *, long long, long long, const char **);
+#elif defined(__APPLE__)
+long long	strtonum(const char *, long long, long long, const char **);
 #endif
 
 #endif

include/sys/socket.h

@@ -0,0 +1,10 @@
+#include_next <sys/socket.h>
+
+#ifndef MG_COMPAT_SYS_SOCKET_H
+#define MG_COMPAT_SYS_SOCKET_H
+
+#if defined(__APPLE__)
+#define MSG_NOSIGNAL	SO_NOSIGPIPE
+#endif
+
+#endif

include/util.h

@@ -1,7 +1,7 @@
 #ifndef MG_COMPAT_UTIL_H
 #define MG_COMPAT_UTIL_H
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(__APPLE__)
 #define FPARSELN_UNESCESC	0x01
 #define FPARSELN_UNESCCONT	0x02
 #define FPARSELN_UNESCCOMM	0x04